An experiment 20 years ago used optical methods to observe the Earthâs core, leading to a temperature estimate of the Earthâs core at about 5000 degrees Celsius. However, those results may have been thrown off the presence of recrystallizing iron particles â which can throw off the experiment.
The news that China is now the largest economy in the world is an embarrassment for Barack Obama and ends America's 142 years at the top.Britain had out-produced the U.S. and its European rivals for much of the 19th century, at the height of the industrial revolution and with trade links across the Empire.n 1872, its economy overtook Britain to become the world's largest, a position it held for the next 142 years. Productivity, leading brands and innovation, coupled with the success of the US dollar and the fact that 62 per cent of the world's financial reserves are held in the currency, kept America on top.
Italy. It is one of the most powerful countries in the world. It is a member in different groups and organizations such as NATO, G7, G8 and the World Trade Organization. It is ranked to have the 9 th largest economy in the world and the 10 th country in terms of spending the highest military expenditure.9.. United Kingdom. It is ranked as the 5 th country in terms of having the most powerful military forces in the world, the 10 th for having the best quality of life and the 6 th country in terms of having the largest economy in the world. 5.